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'''51 Eridani b''' is a "Jupiter-like" planet that orbits the young star [[51 Eridani]], in the constellation [[Eridanus (constellation)|Eridanus]].<ref>{{Cite web |last=Choi |first=Charles |date = August 13, 2015 |title=Found! 'Young Jupiter,' the Smallest Exoplanet Directly Seen by Telescope |url = http://www.space.com/30248-young-jupiter-smallest-directly-imaged-exoplanet.html |accessdate=August 15, 2015}}</ref> It is 96 light years away from the solar system, and it is approximately 20 million years old.<ref>{{cite web |last=Hadhazy |first=Adam |date=August 13, 2015 |title='Young Jupiter' 51 Eridani b: Why Directly Imaging an Exoplanet Is Big |work=space.com |url=http://www.space.com/30238-young-jupiter-exoplanet-51-eridani-b-explained.html |accessdate=August 15, 2015}}</ref>
'''51 Eridani b''' is a "Jupiter-like" planet that orbits the young star [[51 Eridani]], in the constellation [[Eridanus (constellation)|Eridanus]].<ref>{{Cite web |last=Choi |first=Charles |date = August 13, 2015 |title=Found! 'Young Jupiter,' the Smallest Exoplanet Directly Seen by Telescope |url = http://www.space.com/30248-young-jupiter-smallest-directly-imaged-exoplanet.html |access-date=August 15, 2015}}</ref> It is 96 light years away from the solar system, and it is approximately 20 million years old.<ref>{{cite web |last=Hadhazy |first=Adam |date=August 13, 2015 |title='Young Jupiter' 51 Eridani b: Why Directly Imaging an Exoplanet Is Big |work=space.com |url=http://www.space.com/30238-young-jupiter-exoplanet-51-eridani-b-explained.html |access-date=August 15, 2015}}</ref>


== General information ==
== General information ==
51 Eridani b was announced in August 2015, but was discovered in December 2014 using the [[Gemini Planet Imager]], an international project led by the [[Kavli Institute for Particle Astrophysics and Cosmology]]. 51 Eridani b is the first exoplanet discovered by the Gemini Planet Imager.<ref name="news.stanford.edu">{{cite web|url=http://news.stanford.edu/news/2015/august/exoplanet-macintosh-eridani-081315.html|title=Astronomers discover 'young Jupiter' exoplanet|first=Stanford|last=University|date=13 August 2015|publisher=}}</ref> The Gemini Planet Imager was specifically created to discern and evaluate dim, newer planets orbiting bright stars through “direct imaging.”<ref name="nasa.gov">{{cite web|url=http://www.nasa.gov/feature/ames/nasa-scientists-help-understand-newly-discovered-planet|title=NASA Scientists Help Understand Newly Discovered Planet|first=Jessica|last=Culler|date=14 August 2015|publisher=}}</ref> Direct imaging allows astronomers to use adaptive optics to sharpen the resolution of the image of a target star, then obstruct its starlight.<ref name="nasa.gov"/> Any residual incoming light is then scrutinized, and the brightest spots suggest a possible planet.<ref name="nasa.gov"/>
51 Eridani b was announced in August 2015, but was discovered in December 2014 using the [[Gemini Planet Imager]], an international project led by the [[Kavli Institute for Particle Astrophysics and Cosmology]]. 51 Eridani b is the first exoplanet discovered by the Gemini Planet Imager.<ref name="news.stanford.edu">{{cite web|url=http://news.stanford.edu/news/2015/august/exoplanet-macintosh-eridani-081315.html|title=Astronomers discover 'young Jupiter' exoplanet|first=Stanford|last=University|date=13 August 2015}}</ref> The Gemini Planet Imager was specifically created to discern and evaluate dim, newer planets orbiting bright stars through “direct imaging.”<ref name="nasa.gov">{{cite web|url=http://www.nasa.gov/feature/ames/nasa-scientists-help-understand-newly-discovered-planet|title=NASA Scientists Help Understand Newly Discovered Planet|first=Jessica|last=Culler|date=14 August 2015}}</ref> Direct imaging allows astronomers to use adaptive optics to sharpen the resolution of the image of a target star, then obstruct its starlight.<ref name="nasa.gov"/> Any residual incoming light is then scrutinized, and the brightest spots suggest a possible planet.<ref name="nasa.gov"/>


Scientists estimate the mass to be twice that of Jupiter,<ref name="scientificamerican.com"/> and it has the second strongest methane signature of any [[exoplanet]], after GJ504b.<ref>{{Cite web|url = https://www.independent.co.uk/news/science/51-eridani-b-astronomers-discover-young-planet-that-looks-like-jupiter-100-light-years-away-10454531.html&#124;date|title = Astronomers Discover Young Planet That Looks Like Jupiter 100 Light Years Away}}</ref> This methane signature, along with the low luminosity of the object, should produce additional clues as to how 51 Eridani b was formed.<ref name="news.stanford.edu"/> The average temperature is 700 K, which is substantially hotter than the 130 K average temperature of [[Jupiter]], the planet in the Solar System of closest size.<ref>{{Cite web|url = http://www.space.com/30239-young-jupiter-exoplanet-51-eridani-b.html|title = Exoplanet 51 Eridani b: A Red-Hot Young Jupiter Around Distant Star (Infographic)}}</ref> Astronomers also detected the presence of water in the planet's spectrum.<ref>{{cite web|url=https://www.bbc.co.uk/news/science-environment-33922503|title=Young 'alien Jupiter' discovered|date=14 August 2015|publisher=|via=www.bbc.co.uk}}</ref> It orbits the star 51 Eridani in the constellation Eridanus. Atmospheric modeling favors a low surface gravity and a partly cloudy atmosphere.<ref name="scientificamerican.com">{{cite web|url=http://www.scientificamerican.com/article/astronomers-glimpse-a-young-jupiter-51-eridani-b/|title=Astronomers Glimpse a Young Jupiter, 51 Eridani b|first=Lee|last=Billings|publisher=}}</ref> Prior to the discovery of 51 Eridani b, each of the directly-imaged worlds previously discovered have been gas giants many times the mass of Jupiter.<ref name="scientificamerican.com"/>
Scientists estimate the mass to be twice that of Jupiter,<ref name="scientificamerican.com"/> and it has the second strongest methane signature of any [[exoplanet]], after GJ504b.<ref>{{Cite web|url = https://www.independent.co.uk/news/science/51-eridani-b-astronomers-discover-young-planet-that-looks-like-jupiter-100-light-years-away-10454531.html&#124;date|title = Astronomers Discover Young Planet That Looks Like Jupiter 100 Light Years Away}}</ref> This methane signature, along with the low luminosity of the object, should produce additional clues as to how 51 Eridani b was formed.<ref name="news.stanford.edu"/> The average temperature is 700 K, which is substantially hotter than the 130 K average temperature of [[Jupiter]], the planet in the Solar System of closest size.<ref>{{Cite web|url = http://www.space.com/30239-young-jupiter-exoplanet-51-eridani-b.html|title = Exoplanet 51 Eridani b: A Red-Hot Young Jupiter Around Distant Star (Infographic)}}</ref> Astronomers also detected the presence of water in the planet's spectrum.<ref>{{cite web|url=https://www.bbc.co.uk/news/science-environment-33922503|title=Young 'alien Jupiter' discovered|date=14 August 2015|via=www.bbc.co.uk}}</ref> It orbits the star 51 Eridani in the constellation Eridanus. Atmospheric modeling favors a low surface gravity and a partly cloudy atmosphere.<ref name="scientificamerican.com">{{cite web|url=http://www.scientificamerican.com/article/astronomers-glimpse-a-young-jupiter-51-eridani-b/|title=Astronomers Glimpse a Young Jupiter, 51 Eridani b|first=Lee|last=Billings}}</ref> Prior to the discovery of 51 Eridani b, each of the directly-imaged worlds previously discovered have been gas giants many times the mass of Jupiter.<ref name="scientificamerican.com"/>


== References ==
== References ==

Revision as of 23:02, 19 December 2020

51 Eri b
Direct imaging of 51 Eri b
Discovery
Discovered byMacintosh et al.
Discovery dateDec 2014
Imaged
Orbital characteristics
Star51 Eridani
Physical characteristics
1 [1] RJ
Mass2 [1] MJ
Temperature700 K[1]

51 Eridani b is a "Jupiter-like" planet that orbits the young star 51 Eridani, in the constellation Eridanus.[2] It is 96 light years away from the solar system, and it is approximately 20 million years old.[3]

General information

51 Eridani b was announced in August 2015, but was discovered in December 2014 using the Gemini Planet Imager, an international project led by the Kavli Institute for Particle Astrophysics and Cosmology. 51 Eridani b is the first exoplanet discovered by the Gemini Planet Imager.[4] The Gemini Planet Imager was specifically created to discern and evaluate dim, newer planets orbiting bright stars through “direct imaging.”[5] Direct imaging allows astronomers to use adaptive optics to sharpen the resolution of the image of a target star, then obstruct its starlight.[5] Any residual incoming light is then scrutinized, and the brightest spots suggest a possible planet.[5]

Scientists estimate the mass to be twice that of Jupiter,[6] and it has the second strongest methane signature of any exoplanet, after GJ504b.[7] This methane signature, along with the low luminosity of the object, should produce additional clues as to how 51 Eridani b was formed.[4] The average temperature is 700 K, which is substantially hotter than the 130 K average temperature of Jupiter, the planet in the Solar System of closest size.[8] Astronomers also detected the presence of water in the planet's spectrum.[9] It orbits the star 51 Eridani in the constellation Eridanus. Atmospheric modeling favors a low surface gravity and a partly cloudy atmosphere.[6] Prior to the discovery of 51 Eridani b, each of the directly-imaged worlds previously discovered have been gas giants many times the mass of Jupiter.[6]

References

  1. ^ a b c Discovery and spectroscopy of the young Jovian planet 51 Eri b with the Gemini Planet Imager, B. Macintosh, and the GPIES team, Science Published Online August 13, 2015 doi:10.1126/science.aac5891.
  2. ^ Choi, Charles (August 13, 2015). "Found! 'Young Jupiter,' the Smallest Exoplanet Directly Seen by Telescope". Retrieved August 15, 2015.
  3. ^ Hadhazy, Adam (August 13, 2015). "'Young Jupiter' 51 Eridani b: Why Directly Imaging an Exoplanet Is Big". space.com. Retrieved August 15, 2015.
  4. ^ a b University, Stanford (13 August 2015). "Astronomers discover 'young Jupiter' exoplanet".
  5. ^ a b c Culler, Jessica (14 August 2015). "NASA Scientists Help Understand Newly Discovered Planet".
  6. ^ a b c Billings, Lee. "Astronomers Glimpse a Young Jupiter, 51 Eridani b".
  7. ^ "Astronomers Discover Young Planet That Looks Like Jupiter 100 Light Years Away".
  8. ^ "Exoplanet 51 Eridani b: A Red-Hot Young Jupiter Around Distant Star (Infographic)".
  9. ^ "Young 'alien Jupiter' discovered". 14 August 2015 – via www.bbc.co.uk.


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